Clamping tool for thin-walled cylinder parts

Abstract

The clamping tool comprises a base, a supporting rod perpendicular to the surface of the base is fixedly connected to the surface of the base, and a press fitting piece capable of moving in the length direction of the supporting rod is arranged on the supporting rod in a sleeved mode. A plurality of connecting pieces capable of being detachably connected with inner holes of parts to be clamped are arranged on the press-fitting piece, a press-fitting fastening piece is installed at the position, located above the press-fitting piece, of the supporting rod, and the press-fitting fastening piece can act on the press-fitting piece in the direction of the center line of the supporting rod and enables the press-fitting piece to press the parts to be clamped on the surface of the base through the connecting pieces. The device is simple in structure, light, convenient and high in practicability, deformation and strain of the inner hole of the part cannot be easily caused, the inner hole of the part is well protected, the percent of pass of the part is increased, and loss is reduced.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, specifically to a clamping fixture for thin-walled cylindrical parts. Background Technology

[0002] Thin-walled cylindrical parts are widely used in precision machinery and other fields. The grinding accuracy of the external teeth of thin-walled herringbone gears directly affects the meshing performance and service life of the transmission system. These parts are generally characterized by thin walls, strict geometric tolerances, and high requirements for the surface roughness of the inner holes, presenting unique technological challenges in the gear grinding process.

[0003] While traditional clearance-fit mandrel clamping schemes offer the advantage of convenient assembly and disassembly, they suffer from two major technical bottlenecks: First, the assembly clearance between the mandrel and the inner hole of the part can cause radial positioning drift, resulting in significant radial runout error of the gear ring after grinding. Second, during disassembly, the fretting friction between the mandrel and the part can easily create scratches on the inner hole surface, causing the part to be scrapped due to inner hole quality defects. Although hydraulically tightened mandrels achieve interference positioning through the radial expansion of the elastic sleeve, the applied radial pressure can induce elastic deformation of thin-walled parts, resulting in larger alignment errors and failing to meet the high-precision grinding requirements of the parts, thus leading to part scrapping. Utility Model Content

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is: how to provide a clamping fixture for thin-walled cylindrical parts that is easy to clamp, does not easily cause wear to the parts during the clamping process, and provides stable and reliable clamping of the parts.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A clamping fixture for thin-walled cylindrical parts includes a base, a support rod perpendicular to the base surface fixedly connected to the base surface, a pressing component that can move along the length of the support rod sleeved on the support rod, a plurality of connecting components that can be detachably connected to the inner hole of the part to be clamped on the pressing component, and a pressing fastener installed on the support rod above the pressing component. The pressing fastener can act on the pressing component along the center line of the support rod and cause the pressing component to press the part to be clamped onto the base surface through the connecting components.

[0007] When using this invention to clamp a part, first place the base on the worktable, then detachably fix the connector in the inner hole of the part, then fit the part onto the support rod and place it on the surface of the base, so that the lower end face of the part is in close contact with the surface of the base; insert the press-fitting part from the upper end of the support rod and move it into the inner hole of the part, place the press-fitting part on all the connectors, so that the connectors support the press-fitting part, and then install the press-fitting fasteners. The press-fitting fasteners act on the press-fitting part, so that the press-fitting part presses the connectors together. In this way, the press-fitting part applies a force along the axial direction of the part to the part through the connectors, pressing the part onto the base, so that the part and the base form a whole; finally, adjust the posture of the base and align the runout of the inner hole and the upper end face of the part to the requirements of the part processing technology; after the part is clamped, the part is processed.

[0008] As an optimization, the base includes a base plate, with a central column fixedly connected to its upper surface. The central column can be clearance-fitted with the inner hole of the part to be clamped. The centerline of the central column is perpendicular to the plane of the base plate. A support ring is formed by protrusions on the central column, circumferentially arranged around its centerline. The upper surface of the support ring is a press-fit surface and parallel to the plane of the base plate. The support rod is fixedly connected to the top of the central column. Multiple U-shaped notches are evenly spaced along the edge of the base plate around the centerline of the central column. Each U-shaped notch is fitted with a mounting bolt for fixing the base plate. The central column can initially align the radial clearance of the part when it is placed, effectively reducing the installation time between the part and the base and improving installation efficiency. The base can be fixed to the worktable by the mounting bolts at the U-shaped notches.

[0009] As an optimization, the base plate is provided with multiple threaded through holes, the number of which is the same as the number of U-shaped notches. The threaded through holes are staggered between adjacent U-shaped notches, and the center lines of the threaded through holes are perpendicular to the plane of the base plate. The center lines of all threaded through holes and the centers of the bottom arcs of all U-shaped notches lie on the same circumferential path. The arc lengths from the center of the bottom arc of each U-shaped notch to the center lines of the threaded through holes on adjacent sides are the same. Adjusting bolts are provided on the upper surface of the base plate corresponding to the position of each threaded through hole, with the screw section of the adjusting bolt engaging with the threaded through hole. By tightening the adjusting bolts, the screw section of the adjusting bolt abuts against and supports the worktable, completing the alignment of the parts fixed on the base.

[0010] As an optimization, the lower end of the support rod is provided with a connecting thread, and the base is recessed with a connecting screw hole corresponding to the position of the support rod. The support rod is threaded into the connecting screw hole through the connecting thread. This facilitates the disassembly and assembly of the support rod, making it easy to replace and maintain.

[0011] As an optimization, the press-fit component includes a pressure plate, and the connecting component includes support bolts. Multiple support bolts are evenly spaced around the centerline of the support rod, with the centerlines intersecting and perpendicular to the centerline of the support rod. The threaded sections of the support bolts are threaded onto the part to be clamped. The lower surface of the pressure plate rests on the heads of each support bolt, and the plane of the pressure plate is perpendicular to the centerline of the support rod. In some parts, such as thin-walled herringbone gears, threaded holes are evenly spaced around the circumference of the relief groove on the outer wall of the gear. These threaded holes are arranged along the radial direction of the gear. Therefore, the connecting component can be set as support bolts, with the threaded sections of the support bolts threaded into the threaded holes on the gear. This facilitates the support and leveling of the press-fit component, as well as the installation and disassembly of the connecting component.

[0012] As an optimization, a support plane is provided on one side of the head of the support bolt, the support plane being parallel to the center line of the support bolt, and the plane containing the pressure plate being parallel to the support plane, with the pressure plate placed on the support plane. The support plane not only facilitates the support of the press-fit component but also facilitates leveling of the press-fit component; additionally, the head of the support bolt can be designed with an internal hexagonal structure for easy installation and disassembly.

[0013] As an optimization, the distance between the support plane and the centerline of the support bolt is greater than the radius of the threaded section of the support bolt.

[0014] As an optimization, the upper end of the support rod is provided with a fastening thread, and the press-fit fastener includes a fastening nut that is threadedly connected to the support rod via the fastening thread. A press-fit washer is fitted on the support rod at a position between the fastening nut and the press-fit component. By rotating the fastening nut, the fastening nut can drive the press-fit washer to apply a downward force to the press-fit component, thereby better securing the parts.

[0015] Compared to existing technologies, this utility model uses a pressure plate and double-ended studs (support rods) for fastening, which avoids the need to align the inner hole and end face of the part. When aligning the reference, it can be directly aligned on the end face and inner hole of the part, avoiding the need for the reference to be moved during alignment. The support plane on the support bolt installed in the inner hole increases the contact area between the pressure plate and the support bolt, which is more conducive to improving the clamping stability of the device. In addition, the disassembly of the mandrel body of this utility model is simpler than that of the clearance mandrel, and it can reduce the deformation of the inner hole of the part compared to the hydraulic mandrel clamping. In particular, the combination device of pressure plate and double-ended studs (support rods) is simpler, lighter, and more practical, and will not easily cause deformation and scratches to the inner hole of the part, thus protecting the inner hole of the part, improving the part qualification rate, and reducing losses. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the structure of this utility model when clamped with a thin-walled herringbone gear;

[0017] Figure 2 This is a top view of the base in this utility model;

[0018] Figure 3 This is a top view of the support bolt in this utility model. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0020] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] like Figures 1 to 3 As shown, the clamping fixture for thin-walled cylindrical parts in this specific embodiment includes a base. A support rod 1 perpendicular to the base surface is fixedly connected to the surface of the base. A pressing component 2 that can move along the length of the support rod 1 is sleeved on the support rod 1. The pressing component 2 is provided with a plurality of connecting components 3 that can be detachably connected to the inner hole of the part 11 to be clamped. A pressing fastener is installed on the support rod 1 and above the pressing component 2. The pressing fastener can act on the pressing component 2 along the center line of the support rod 1 and make the pressing component 2 press the part 11 to be clamped onto the surface of the base through the connecting components 3.

[0022] In this specific embodiment, the base includes a base plate 4, and a central column 5 is fixedly connected to the upper surface of the base plate 4. The central column 5 can be clearance-fitted with the inner hole of the part 11 to be clamped. The center line of the central column 5 is perpendicular to the plane of the base plate 4. A support ring 6 is formed by protrusions on the column body of the central column and is arranged around the center line of the central column. The upper surface of the support ring 6 is a press-fit surface and is parallel to the plane of the base plate 4. The support rod 1 is fixedly connected to the top of the central column 5. Multiple U-shaped notches 7 are evenly spaced around the center line of the central column 5 on the edge of the base plate 4. Each U-shaped notch 7 is provided with a mounting bolt for fixing the base plate 4.

[0023] In this specific embodiment, the base plate 4 is provided with a plurality of threaded through holes 8, the number of threaded through holes 8 being the same as the number of U-shaped notches 7. The threaded through holes 8 are staggered between two adjacent U-shaped notches 7. The center line of the threaded through holes 8 is perpendicular to the plane of the base plate 4. The center line of all threaded through holes 8 and the center of the bottom arc of all U-shaped notches 7 are located on the same circumferential path. The arc length between the center of the bottom arc of the U-shaped notch 7 and the center line of the threaded through holes 8 on the adjacent sides is the same. Adjusting bolts are provided on the upper surface of the base plate 4 corresponding to the position of each threaded through hole 8. The screw section of the adjusting bolt is threadedly engaged with the threaded through hole 8.

[0024] In this specific embodiment, the lower end of the support rod 1 is provided with a connecting thread, and the base is recessed with a connecting screw hole corresponding to the position of the support rod 1. The support rod 1 is threadedly connected to the connecting screw hole through the connecting thread.

[0025] In this specific embodiment, the pressing component 2 includes a pressure plate, and the connecting component 3 includes support bolts. Multiple support bolts are evenly spaced around the center line of the support rod 1. The center line of the support bolts intersects with and is perpendicular to the center line of the support rod 1. The threaded section of the support bolt is used to be threaded onto the part 11 to be clamped. The lower surface of the pressure plate is placed on the head of each support bolt, and the plane of the pressure plate is perpendicular to the center line of the support rod.

[0026] In this specific embodiment, a support plane is provided on one side of the head of the support bolt. The support plane is parallel to the center line of the support bolt. The plane where the pressure plate is located is parallel to the support plane. The pressure plate is placed on the support plane.

[0027] In this specific embodiment, the distance between the supporting plane and the center line of the supporting bolt is greater than the radius of the threaded section of the supporting bolt.

[0028] In this specific embodiment, the upper end of the support rod 1 is provided with a fastening thread, and the press-fit fastener includes a fastening nut 9 that is threadedly connected to the support rod 1 through the fastening thread. A press-fit washer 10 is sleeved on the support rod 1 at a position between the fastening nut 9 and the press-fit component 2.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail can be made without departing from the spirit and scope of this utility model as defined in the appended claims.

Claims

1. A clamping fixture for thin-walled cylindrical parts, comprising a base, characterized in that: A support rod perpendicular to the base surface is fixedly connected to the base surface. A pressing component that can move along the length of the support rod is sleeved on the support rod. The pressing component is provided with multiple connectors that can be detachably connected to the inner hole of the part to be clamped. A pressing fastener is installed on the support rod above the pressing component. The pressing fastener can act on the pressing component along the center line of the support rod and make the pressing component press the part to be clamped onto the base surface through the connectors.

2. The clamping fixture for thin-walled cylindrical parts according to claim 1, characterized in that: The base includes a base plate, on the upper surface of which a central column is fixedly connected. The central column can be clearance-fitted with the inner hole of the part to be clamped. The centerline of the central column is perpendicular to the plane of the base plate. A support ring is formed by protrusions on the column body around the centerline of the central column. The upper surface of the support ring is a press-fit surface and parallel to the plane of the base plate. The support rod is fixedly connected to the top of the central column. Multiple U-shaped notches are evenly spaced around the centerline of the central column on the edge of the base plate. Each U-shaped notch is provided with a mounting bolt for fixing the base plate.

3. The clamping fixture for thin-walled cylindrical parts according to claim 2, characterized in that: The base plate is provided with a plurality of threaded through holes, the number of which is the same as the number of U-shaped notches. The threaded through holes are staggered between two adjacent U-shaped notches. The center line of the threaded through holes is perpendicular to the plane of the base plate. The center line of all the threaded through holes and the center of the bottom arc of all the U-shaped notches are located on the same circumferential path. The arc length between the center of the bottom arc of the U-shaped notch and the center line of the threaded through holes on the adjacent sides is the same. An adjusting bolt is provided on the upper surface of the base plate corresponding to the position of each threaded through hole. The screw section of the adjusting bolt is threadedly engaged with the threaded through hole.

4. The clamping fixture for thin-walled cylindrical parts according to claim 1, characterized in that: The lower end of the support rod is provided with a connecting thread, and the base is recessed with a connecting screw hole corresponding to the position of the support rod. The support rod is threaded into the connecting screw hole through the connecting thread.

5. The clamping fixture for thin-walled cylindrical parts according to claim 1, characterized in that: The pressing component includes a pressure plate, and the connecting component includes support bolts. Multiple support bolts are evenly spaced around the center line of the support rod. The center line of the support bolts intersects with and is perpendicular to the center line of the support rod. The threaded section of the support bolt is used to connect to the part to be clamped. The lower surface of the pressure plate is placed on the head of each support bolt, and the plane of the pressure plate is perpendicular to the center line of the support rod.

6. The clamping fixture for thin-walled cylindrical parts according to claim 5, characterized in that: A support plane is provided on one side of the head of the support bolt. The support plane is parallel to the center line of the support bolt. The plane where the pressure plate is located is parallel to the support plane. The pressure plate is placed on the support plane.

7. The clamping fixture for thin-walled cylindrical parts according to claim 6, characterized in that: The distance between the support plane and the center line of the support bolt is greater than the radius of the bolt section of the support bolt.

8. The clamping fixture for thin-walled cylindrical parts according to claim 1, characterized in that: The upper end of the support rod is provided with a fastening thread, and the press-fit fastener includes a fastening nut that is threadedly connected to the support rod through the fastening thread. A press-fit washer is sleeved on the support rod at a position between the fastening nut and the press-fit component.

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